/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
This one should be use only by the sequencer the key tangents data is transform to fit the expected data we have in the old matinee code.
void GetCurveDataForSequencer ( const [FFbxAnimCurveHandle](API\Editor\UnrealEd\FFbxAnimCurveHandle) & CurveHandle, [FRichCurve](API\Runtime\Engine\Curves\FRichCurve) & RichCurve, bool bNegative, float Scale ) const